The present study was designed to investigate the effect of zebularine in comparison to and in combination with trichostatin A on p21Cip1/Waf1/Sdi1, p27Kip1, p57Kip2, DNMT1, DNMT3a and DNMT3b, Class I HDACs (HDACs 1, 2, 3) and Class II HDACs (HDACs 4, 5, 6) gene expression, cell growth inhibition and apoptosis induction in colon cancer LS 174T cell line. Here, DNMT1 is linked to malignant colon neoplasm.